buildsys: fix building with make-3.82+
buildsys: fix building with make-3.82+

We can't merge pattern and normal rules as newer make barfs:
	*** mixed implicit and normal rules.  Stop.

Signed-off-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@gentoo.org>

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc